let fly

Discharge a missile or fire a weapon; also, attack verbally. For example, He let fly a rotten egg at the speaker, or They let fly some insults laced with four-letter words. The first usage dates from about a.d. 1000, the second from the late 1500s.

let ˈfly (at somebody/something) (with something)

(informal) 1 throw, shoot, etc. something with great force: He aimed his gun and let fly.2 attack somebody/something: When I told him that I couldn’t find the letter, he let fly at me. ♢ She let fly at her neighbour with a stream of insults.

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